.header{
  position: fixed;
  top: 0;
  width: 100%;
  height: 75px;
  background-color: #fff;
  .logo{
    height: 75px;
    width: 183px;
    background: url(../img/logo.jpg) no-repeat center;
  }
  ul{
    li{
      float: left;
      margin: 0 25px;
      line-height: 75px;
      a{
        font-size: 18px;
        color: #333333;
      }
      .active{
        color: #ffa33b;
      }
    }
  }
}